Method of biasing a photoconductive detector and detector appara

Details Method of biasing a photoconductive detector and detector appara Method of biasing a photoconductive detector and detector appara

1982-11-15

1985-08-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214R, H01J 4014

Patent

active

045352321

ABSTRACT:
It is a problem extracting the photosignal component from detector output, to the exclusion of pedestal bias response. To overcome this, a time varying bias signal is applied to each element of the detector. The duration of the time varying bias signal, or if a periodic signal, the signal period, is chosen as long compared to photocarrier lifetime and the signal amplitude is large enough to range over a non-linear portion of the responsivity characteristic of each element. The bias signal contains a d.c. component so that the bias signal ranges about a point of operation--a point of asymmetry lying on the responsivity characteristic. The photosignal component of the output signal may be removed by time averaging or by harmonic separation. Alternatively the bias signal may be modulated, and the photosignal component extracted by detection of demodulated signal.

REFERENCES:
patent: 3700905 (1972-10-01), Parkin et al.
patent: 3891843 (1975-06-01), Parkin
patent: 3924150 (1975-12-01), Wasa et al.

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